Analog Devices Inc. LTC2158IUP-14#TRPBF

Overview

LTC2158IUP-14#TRPBF from Analog Devices (acquired Linear Technology) is a dual-channel, 14-bit, 310Msps analog-to-digital converter optimized for high-frequency undersampling in communications infrastructure. It delivers 68.8dBFS SNR, 88dB SFDR at 70MHz input, 1.25GHz full-power bandwidth, and operates from a single 1.8V supply with DDR LVDS outputs. It serves as the front-end digitizer in cellular basestations and software-defined radios.

For engineers reviewing the LTC2158IUP-14#TRPBF datasheet, LTC2158IUP-14#TRPBF pinout, LTC2158IUP-14#TRPBF application, or LTC2158IUP-14#TRPBF equivalent, key selection criteria include simultaneous sampling accuracy, 1.32V_P-P differential input drive compatibility, SPI-configurable LVDS output current (1.75–4.5mA), clock duty cycle stabilization, and –40°C to 85°C industrial temperature operation.

Technical Context

The LTC2158IUP-14#TRPBF employs a pipelined ADC architecture with integrated sample-and-hold and correction logic, supporting true simultaneous sampling across two channels via a shared encode circuit. Its 1.25GHz input bandwidth enables RF undersampling of signals up to 900MHz while maintaining 68.4dBFS SNR at 140MHz.

Digital interface uses DDR LVDS with programmable output current (1.75–4.5mA), optional internal 100Ω termination, and configurable CLKOUT phase shift (0°/45°/90°/135°). Configuration is handled via a 3-wire SPI port controlling mode registers for sleep/nap modes, duty cycle stabilizer, and output formatting.

Key Specifications

Pinout & Package

64-lead (9mm × 9mm) plastic QFN package with exposed thermal pad (Pin 65 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, high-speed ADC applications.

Compared with AD9680BCPZ-500 and LTC2268IUP-14#TRPBF, the LTC2158IUP-14#TRPBF uniquely balances 310Msps performance with DDR LVDS simplicity, integrated clock stabilization, and industrial temperature rating-making it optimal for space-constrained, thermally demanding wireless infrastructure where FPGA resource count and layout complexity must be minimized.

Availability

LTC2158IUP-14#TRPBF is available at Aetrix Electronics and suitable for cellular basestations, software-defined radios, and medical ultrasound imaging requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2158IUP-14#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2158IUP-14#TRPBF belongs to ADI's high-speed data converter product line, designed specifically for demanding RF and IF digitization in wireless infrastructure, defense electronics, and precision test equipment where wide bandwidth, low noise, and deterministic latency are critical.

FAQ

What is the guaranteed operating temperature range for the LTC2158IUP-14#TRPBF?

The LTC2158IUP-14#TRPBF is specified for continuous operation from –40°C to +85°C, meeting industrial-grade reliability requirements. This range is confirmed in the Absolute Maximum Ratings table and applies to all AC and DC specifications marked with the "l" symbol, including SNR, SFDR, INL, and DNL performance across temperature.

Does the LTC2158IUP-14#TRPBF support internal voltage reference, and how is it enabled?

Yes, the LTC2158IUP-14#TRPBF includes an internal 1.25V reference. To enable it for the standard 1.32V_P-P input range, connect the SENSE pin (Pin 7) directly to VDD. When configured this way, the internal reference sets VCM ≈ 0.435 × VDD and establishes the full-scale differential input range without external components.

How many LVDS output pairs does the LTC2158IUP-14#TRPBF provide, and what data do they carry?

The LTC2158IUP-14#TRPBF provides 14 differential LVDS output pairs: seven for Channel A (DA0_1+/- through DA12_13+/-), seven for Channel B (DB0_1+/- through DB12_13+/-), plus OF+/- and CLKOUT+/- - totaling 16 LVDS signals. Each pair carries two time-multiplexed data bits (even/odd) in DDR format, delivering 14 bits per channel per sample cycle.

Can the LTC2158IUP-14#TRPBF operate with non-50% duty cycle encode clocks?

Yes - the LTC2158IUP-14#TRPBF includes an optional clock duty cycle stabilizer that accepts external encode clocks with 30%–70% duty cycle and generates an internal 50% ±5% clock. This feature is enabled via SPI Register A2 or by asserting CS in parallel programming mode, eliminating external clock conditioning circuitry.

What is the pipeline latency of the LTC2158IUP-14#TRPBF, and is it fixed or variable?

The LTC2158IUP-14#TRPBF has a fixed pipeline latency of six clock cycles from ENC edge to valid data on the LVDS outputs. This deterministic latency is independent of configuration settings such as LVDS current, duty cycle stabilizer state, or SPI register values - enabling precise timing alignment in FPGA-based digital signal processing chains.